Nomenclature of the tourmaline-supergroup minerals

@article{Henry2011NomenclatureOT,
  title={Nomenclature of the tourmaline-supergroup minerals},
  author={Darrell J. Henry and Milan Nov{\'a}k and Frank Christopher Hawthorne and Andreas Ertl and Barbara L. Dutrow and Pavel Uher and Federico Pezzotta},
  journal={American Mineralogist},
  year={2011},
  volume={96},
  pages={895 - 913}
}
Abstract A nomenclature for tourmaline-supergroup minerals is based on chemical systematics using the generalized tourmaline structural formula: XY3Z6(T6O18)(BO3)3V3W, where the most common ions (or vacancy) at each site are X = Na1+, Ca2+, K1+, and vacancy; Y = Fe2+, Mg2+, Mn2+, Al3+, Li1+, Fe3+, and Cr3+; Z = Al3+, Fe3+, Mg2+, and Cr3+; T = Si4+, Al3+, and B3+; B = B3+; V = OH1- and O2-; and W = OH1-, F1-, and O2-. Most compositional variability occurs at the X, Y, Z, W, and V sites… 

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A systematic classification of the tourmaline-group minerals, general formula X Y3 Z6 (Γ6Oi8) (B03)3 V3W, is proposed, based on chemical composition and ordering at the different crystallographic

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TOURMALINE: STRUCTURAL FORMULA CALCULATIONS

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